204 Annals of the South African Museum. 



Paridotea as regards the composition of the pleon ; but differs from 

 both in having only two plumose setae on the inner plate of the first 

 maxilla. 



ENGIDOTEA LOB ATA (Miers). 

 (Plate XVII. C.) 



1847. Idotea iobata, White, List. Cr. Brit. Mus. p. 95, descript. nulla. 

 1881. ,, ,, Miers, J. Linn. Soc. Lond. vol. 16, p. 57, plate ii. 



figs. 8, 9. 



Described from one dry specimen in the British Museum, without 

 locality. 



Two specimens, 1<? and 1 immature ( 2 ?), in the South African 

 Museum (No. 8824) agree with Miers' description, except in a few 

 minor details, which may be due to their larger size. 



First antenna reaches only to the extremity of the ante-penulti- 

 mate peduncular joint of second antenna, flagellum with ca. 15 

 groups of setae. 



Second antenna extends only to the posterior margin of second 

 peraeon segment ; flagellum in the smaller specimen 10-jointed, in 

 the larger 12-jointed. 



The mouth parts, not described by Miers, are as follows : 



Epistome ti-ansverse, hardly flanking the labrum, which is twice 

 as broad as long, with hairs on the rounded angles but not in the 

 centre. 



Lower lip, lobes quadrate, inner angles rounded, with stout setae 

 and smaller setules. 



Mandibles, short and stout, cutting edge with 4 teeth, secondary 

 cutting edge with 3 teeth, molar denticulate, spine-row with ca. 5 

 plumose spines. 



First maxilla, outer plate with 10 spines, inner plate with 2 plumose 

 setae and a minute setule. 



Second maxilla is remarkable in having only 2 lobes (in both 

 specimens), the outer with 5-6 minutely serrate spines, the inner 

 with about 12 spines and, on the inner apical angle, 2 long stout 

 plumose setae. 



Maxillipeds 7-jointed, 7th joint much smaller than 6th, inner plate 

 with about 10 apical spines and one strong coupling-hook, epipod 

 lanceolate, slightly curved inwards. 



First peraeopods (gnathopods), 6th joint with 2 stout serrate spines 

 on inner margin ; 6th joint of the other peraeopods with one serrate 

 spine before the middle. Seventh joint in all the peraeopods strongly 

 biunguiculate. 



